Expected browser support

What are the supported browsers out of the box for this product? I played around a little with the kitchensink examples in Chrome and they seemed to work ok. I tried in IE 11 and nothing would run.

I get the same Invalid Character error that has plagued your examples for months now (really need to fix this - doesn't like using the back tick quote) -

File: kitchensink, Line: 190, Column: 33

// Set title
window.document.title = `Sencha | ${product} Examples`;

Beyond this, there is now a syntax error on the class keyword -

File: main.js, Line: 1, Column: 1424

I'm guessing using WebComponents and modern JS syntax might require some sort of polyfill to get it to work in some versions of IE. So that's the question - what versions of IE will be supported and do you have an official polyfill solution so that this will work eventually in IE11+?